Machine for making wire tacks.



C. LEHR.

MACHINE FOR MAKING WIRE TACKS. APPLICATION FILED APR. 24. i913.

1, 1%,75. Patented Mar. 7,1916.

2 SHEETS-SHEET 1. 5? a I c R? I I I I I I I I I T I i, as

Int/e ntar- Wz'ZnasseS:

C. LEHR.

MACHINE FOR MAKING WIRE TACKS.

APPLICATION FILED APR-24, 1913.

Patented Mar. 7, 1916.

2 SHEETS-SHEET 2 IVZI/ZnoT 4M4 MJQ 1 r 1 1 r l CARL LEHR, OF HOMBOK, AUSTRIA-HUNGARY.

MACHINE FOR MAKING WIRE TACKS.

. Specification of Letters Patent.

Patented Mar. '7, 1916.

Application filed April 24, 1913. Serial No 763,459.

To all whom it may concern Be it known that I, CARL Lane, a citizen of Austria-Hungary, residing at Hombok, :Moravia, Austria-Hungary, have invented certain new and useful Improvements in Machines for Making Wire Tacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it'appertains to make and use the same.

This invention relates to new and useful improvements in machines for making tacks from a continuous wire.

It is the object of my invention to construct a machine of the above class which shall be especially adapted for producing strong, uniformly shaped, burless, sharppointed shoe-tacks.

With this object in view my improved machine consists in the novel combination of the following elements: first, a heading punch cotiperating with two snugly closing holding dies clamping with semicircular grooves the wire beneath thehead to be formed, second, four pressing dies giving to the lower part of the blank a tapering, souare shape, and third. two cutting dies independent of the holding and pressing dies and shaping and cutting the end of the blank.

In order that my invention may be properly understood and readily. carried into effect, I have hereunto appended two sheets of drawings, of which- Figure 1 is a plan of the machine em bodvine my invention. Fig. 2 is an enlarged fragmentary front elevation showing in particular the open holding dies and the pressing dies. Fig.- 3 is a like elevation with the cutting dies in front of the parts shown in Fig. 2. Fig. 4,- is a section on line m-w of, Fig; 2. Fig. 5 illustrates a tack produced by my improved machine.

Referring to the drawings by reference characters, 1, 2, 3, and 4 denote the four pressing dies. 9 and 10 denote the holding dies. 20 and 21 indicate the cutting-dies. and 22 indicates the heading punc 1. The driving shaft 23 is provided at its outer end with an eccentric 2a. which through suitable mechanism operates the sliding feed block 25. The feed block comprises the fin ers 26, 27 gripping and feeding the wire 28 in the known manner in between the pressing dies. In front of the block 29 there are of a diameter the set-screws 42, 43

mounted the plates 7 and 8. The plate 8 is fast and accommodates in guides the dies 1 and 3, while the plate 7 accommodating the dies 2 and 4 is moved through the link 30 and the lever 6 pivoted at 31 from the camdisk 5 keyed on the driving-shaft The working faces of the four pressing-dies form a tapering square hole the cross-section of which diminishes as the plate 7 is moved inward. The construction and operation of the coacting four pressing dies is well known in the art and needs no further description.. The pressing-dies are held in their guides by the covers 12, 13. The inner edges of these covers form a dove-tail guide 18 for the holding dies 9, 10. The holding-dies have in their end-planes semicircular grooves corresponding with the diameter of the wire of which the tacks are made. The position of the die 9 may be adjusted by the set-screw 19 on the fast plate 8. The die 10 is connected by its shank 17 with the lever 15 pivoted at 34 to which motion is imparted by the cam 35 of the disk 5 and which is held in contact with the disk 5 by the spring 32. Pivotally mounted at 36, 37 are the two-armed levers 38, 39 actuated by the cams 40, 41 on the driving shaft 23 and carrying at their front ends for the cutting and pointing dles 20, 21, the working ends of which are suitably notched and coiiperate to cut the blank from the wire and to form a tapering lance shape or a pyramidal point. The cutting dies 20, 21 are adjustably fastened on the upper ends of the levers 44, 45 pivoted at 46, 4;? respectively and connected at their lower ends by the spring 48. The shank 49 of the header 22 guided in the axial line of the machine is normally held away from the clamping dies by a cam 50 of the driving shaft entering into a slot 51 of the header shank. A strong wooden spring 52 forces the header against the holding dies as soon as the cam 50 leaves the slot 51 of the shank a9.

The operation of the machine is as follows: The wire is from the latter. The press ng dies come according to the shape of the cam-disk 5 once or twice into action to form the square tapering lower part a of the'shank of the tack. Simultaneously or immediately thereupon the dies 9, 10 clamp the upper part b of the blank the round section of which is fed in the pressing diesand clamping dies as to project with its end with semicircular grooves to clamp the wire the combination of a heading-punch, two.

holding-dies provided in their working ends beneath the tack-head to be formed, four cooperating pressing-dies to shape a tapering square lower portion of the shank of the tack arranged on one side of the holding-dies, separate cutting-dies for shaping the point of the tack and for severing the tack from the Wire arranged on the other side of the holding-dies, and means for feeding the Wire.

2. In a machine of the character set forth, the combination of a heading-punch, two holding-dies provided in their Working ends wlth semlcircular grooves to clamp the wire beneath the tack-head to be formed, four cooperating pressing-dies to shape a tapering square lower portion of the shank of the tack arranged on one side of and in immediate contact with the holding-dies,

separate cutting-dies for shaping the point of the tack and for severing the tack from the wire arranged on the other side of the holding dies, and means for feeding the Wire.

3. In a machine of the class described, a

headin -punch, a plurality of holding-dies, a plurality of cuttingand point-shapingdies between the holding-dies and the punch,

a plurality of pressing-dies on the other side of the holding-dies for tapering the lower portion of the shank of the tack,

dies between the holding-dies and the punch,

a plurality of pressing-dies on the other side of the holding-dies for tapering the lower portion of the shank of the tack, means. for operating the cuttingand pointing-dies subsequently to the operation of the other dies, and means for feeding the Wire through the tapering-dies, the holding-dies, and finally through the cuttingand pointing-dies. 5. In a machine of the class described, a heading-punch, a plurality of holding-dies, a plurality of cuttingand point-shapingdies between the holding-dies and the punch, a plurality of pressing-dies on the other side of the holding-dies for tapering the lower portion of the shank of the tack, and providing said shank with a rectangular cross section, means for operating the cuttingand pointing-dies subsequently to the operation of'the other dies, and devices spaced apart to form guides forv the holding-dies and serving in part to retain thepressing dies in position. r In testimony whereof I aflix my signature in presence of two witnesses.

CARL LEHR. Witnesses:

AUGUST FUGGER, ADA MARIA BERGER. 

